Fan belt



Feb. 12 1924.

L. MURRAY FAN BELT Filed May 23, 1921 S ddwm fisw v 0V! ww wwwwwfi r M m V... In W h H F f v w w A n k P 7 b I n ll 5 3 Patented Feb, 12, 1924.

UNITED STTS PATET'FFICE.

LEE MURRAY, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO DURKEE-ATWOOD COM- PANY, 0F MINNEAPOLIS, IVIINNESOTA, A CORPORATION OF MINNESOTA.

FAN BELT.

Application filed May 23, 1921. Serial No. 471,848.

T 0 all whom it may concern:

Be it known that I, LEE MURRAY, a citizen of the United States, resident of Minneapolis, county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in Fan Belts, of which the following is a specification.

Theobject of my invention is to provide a belt, generally designated as a flat belt, designed particularly for use in connection with the fan of an automobile engine, though it may be adapted for other purposes.

The object of the invention is to provide a cover or jacket for the belt, built up of woven strips of biased fabric wrapped around the fabric in such a way that the pressure on the surface of the pulley will tend to squeeze the lapping edges of the fabric jacket together and thereby prevent accidental loosening of the jacket and separation from the fabric core.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claim.

In the accompanying drawings forming part of this specification,

Figure 1 is a perspective View of a flat belt embodying my invention,

Figure 2 is a detail sectional View, showing the manner of wrapping the fabric acket around the strips constituting the core of the belt,

Figure 3 is a sectional View on the line 33 of Figure l.

In the drawing, 2 represents a series of woven strips, cut to a suitable width to form the belt and laid one upon the other. The strips are preferably cut out of the fabric on the bias or obliquely to provide for the slight stretch or give of the belt, a characteristic that has been found to be desirable, particularly in these short belts used for transmitting power to the fan of an automobile engine. The strips are composed of a material that is adapted to be vulcanized to form a single continuous homogeneous core for the belt when the vulcanizing operation has been completed.

For the purpose of protecting the edges of the belt from the entrance of oil or grease and to hold the strips of fabric firmly together during the vulcanizing operation, I provide a jacket or cover consisting of a sheet 3 of suitable material for vulcanizing, preferably of rubberized fabric cut to a suitable width and wrapped around the core, as indicated in Figure 2, the longitudinal edges lapping each other, as shown. The jacket is so placed on the core that the lapping edges will be on the inner surface of the belt or the surface that comes in contact with the face of the pulley, so that while the belt is in use, the pressure of the pulley thereon will serve to squeeze the lapping edges of the jacket and prevent separation thereof. The opening of the joint or seambetween the edges is further prevented by vulcanizing and when this has been done, it will be impossible for oil or grease to enter or in any I\Ovay come in contact with the core of the elt.

The belt may, of course, be made in different lengths and varying widths and the number of strips of fabric in the core may be increased or decreased, as desired.

I claim as my invention:

An endless belt composed of a concentrically arranged series of fabric strips cut obliquely to the direction of the threads of the fabric to allow longitudinal stretch thereof, said strips being laid unattachedto each other one upon the other with their corresponding longitudinal edges in alignment substantially and a rubberized jacket wrapped around said strips and having its longitudinal edges lapping each other lengthwise of the belt on the innerface thereof for contact of said lapping edges with the face of the pulley, said jacket concealing and protecting the raw cut edges of the fabric and said strips and jacket being vulcanized to form a homogeneous endless belt.

In witness whereof, I have hereunto set my hand this 17th day of May 1921.

LEE MURRAY. 

